How are the eyes of a squid more similar to vertebrate eyes than the eyes of other invertebrate?

Squid eyes are more similar to vertebrate eyes in their structural design, particularly due to having a lens, retina, and a similar focus mechanism, allowing for sharp images. Unlike other invertebrates, which often have compound eyes, squid have a single, camera-like eye that enables better resolution and depth perception. Additionally, the optic nerve in squid is positioned behind the retina, akin to the arrangement in vertebrates, contrasting with the front-facing orientation found in many other invertebrates. These features highlight a convergent evolution in visual systems between squid and vertebrates.